[@Monochromatic Rainbow] Don't sweat it. A block's a block. What I've found useful is reading back through what's happened so far, switching to another story/type of writing, taking a break from trying to write, staying up very late and having inspiration smack you awake, or just changing your scenery (your choice to take your writing with you or not). If those don't work, then, put it down to my lack of sleep. 

[s]Guess which of the above I was using...[/s]